Komatsu PC118MR-8, Operation And Maintenance Manual

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FUNCTIONING
USE OF THE MACHINE AND RELATED CONTROLS
3-121
Checking the wiring system
WARNING
q
If fuses are corroded, rusted or do not hold well in place, replace them with fuses featuring the same
rating; before replacing a fuse, make sure that both the starter key and the battery main switch are
turned to OFF.
q
If cable harness have short-circuit traces, contact the Komatsu distributor to find the failure cause and
repair it.
q
Before checking the wiring, take all the necessary safety precautions.
q
Always keep the battery surface clean and make sure that the charge level warning light is always
visible.
Make sure that the fuses are not damaged, that fuses with the required capacity are used, that there are no
disconnected, broken, or short-circuited wires; furthermore, check the terminals, and tighten any loose ones.
Carefully check the cables of the battery, the starter and the alternator.

In addition, remove any flammable material that may have accumulated around the battery.
For troubleshooting and repairs, contact your Komatsu distributor.
Checking operation of working lights
Check that the working lights and cab lights switch on correctly. Check that the lights are clean and undamaged.
If any of the lights do not illuminate, the relative bulb may be blown or there may be a disconnected wire; ask you
Komatsu distributor to rectify the problem.
1. Turn the ignition switch to position ON.
2. Turn on the light switch (night mode a / day mode b) and
check that the working lights illuminate.
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